# GPT-5.6 Terra vs O1

As of Oct 15, 2026, GPT-5.6 Terra leads O1 in 5 of 5 shared categories: General LLM, Reasoning, Science, Long context, and Abstraction (ARC).

GPT-5.6 Terra: $4.5 per 1M blended tokens.

O1: $26.25 per 1M blended tokens.

GPT-5.6 Terra: closed weights.

O1: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.6 Terra leads O1 in General LLM at #44 against #146.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.6 Terra leads O1 in Reasoning at #41 against #153.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.6 Terra leads O1 in Science at #15 against #77.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.6 Terra leads O1 in Long context at #54 against #143.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.6 Terra leads O1 in Abstraction (ARC) at #4 against #57.

As of Oct 15, 2026, GPT-5.6 Terra is ranked #4 in Abstraction (ARC) (since Oct 15, 2026; sources ARC-AGI; methodology v1.0).

As of Oct 15, 2026, O1 is a former state-of-the-art holder in General LLM (since Jan 28, 2025; sources LMArena Text (style-controlled, overall); methodology v1.0).